In the very early 50's, I remember we were the only house on our block with a garage door opener! My Father's company had done some radar work for the gummint during the war, and they used some of the knowledge and componentry to develop an opener that would open automatically when you pulled into the driveway - or you could push a button on the dash and open it - I remember Mom using it in our 1949 Studebaker on a rainy day and marveling at the fact that she didn't have to get out of the car to open the door......